The first dinosaur belly was found in a Chinese fossil Smart News Science

Scientists have long speculated that egg-laying dinosaurs will have a navel scar, but this research is the first to find evidence of this. (Pictured: Representation of an artist Psittacosaurus and her navel scars)
Jagged Fang Designs

Paleontologists have found the oldest belly button known to science. It belongs to A Psittacosaurus, Ceratopsia member of dinosaur horns in a fossil covered in China. The belly does not come from the umbilical cord, as is the case with mammals, but from the yolk sac of the egg-laying creature, it has been reported. Science alerts Carly Cassella. Details of the finding were published this month BMC Biology.

Modern egg breeders like snakes and birds lose their belly button scars within a few days or weeks of hatching. But other organisms maintain a “navel scar” for life. While inside the egg, the embryo’s belly is attached to the yolk sac, which provides the embryo with a source of food to grow and develop. The scar appears when the embryo is released from the yolk sac and other membranes, before or while it comes out of the egg. The scar, known as the navel scar, is a non-mammalian belly button, it has been reported Gizmodorena Jeanne Timmons. The Psittacosaurus The umbilical cord is similar to an adult alligator and is the first example of a non-bird dinosaur dating back to before the Cenozoic 66 million years ago. Science Alert reports.

Psittacosaurus It was a bipedal dinosaur that lived in the early Cretaceous. Fossils of the horned dinosaur found in Mongolia and China date from 100 million to 22 million years ago. Psittacosaurus It was almost 7 meters long and stood out for its tall, narrow skull with a parrot-shaped beak. Paleontologists have found the same thing Psittacosaurus dinosaur cloaca fossil and anti-camouflage, Gizmodo reports.

Fossil dinosaur image and navel scar analysis

The team was able to work on the navel scar due to a change in the skin and scale of the dinosaur’s abdomen.

Bell et al. 2022

The researchers imagined an elusive belly button with laser-stimulated fluorescence (LSF) using an imaging technique. A modified version of the LSF was used, in part by Michael Pittman, a vertebrate paleontologist at the University of Hong Kong, and Thomas G. Kaye, a paleontologist at the Foundation for Scientific Advancement, the author of the study. The modified imaging method increases the laser intensity in pre-established laser imaging techniques without damaging the grains, allowing fine details to be seen in fossils that would not otherwise be visible. Gizmodo reports.

The Psittacosaurus The belly was found in 2002 in China, lying on its back. Using LSF, the team was able to study each scale, wrinkle, and pattern recorded in a preserved fossil. “The LSF captures the details in a spectacular way,” said Phil Bell, a dinosaur paleontologist involved in the study. Gizmodo. “It looks like the animal can get up and walk away. You can see all the wrinkles and small bumps on the skin. It looks so fresh. I am fascinated by the depiction of these animals as living and breathing creatures, rather than mere dead skeletons. Bringing them to life is one of the main goals of my work. ”

The group was able to imagine a navel scar that had faded over time, seeing a change in the skin and scales pattern of the dino’s belly. They also determined that the scar was not from a healed injury because the navel scales were smooth and were located in the center line of the dinosaur. If the scar were an injury, regenerative tissue would appear, which could be consistent with the scaling pattern and cut. To determine the age of the fossil, the group measured the length and growth of its femur and saw that the issue was approaching sexual maturity at the age of six or seven, each. Gizmodo.

Scientists have long speculated that egg-laying dinosaurs will have a navel scar, but this research is the first to find evidence of this. Science Alert reports. Researchers have indicated that while a scar was found in this specimen, it may not have been present in all of the bird dinosaurs.


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